Liquid meter



June 10, 1930. R. s. BAS'SETT LIQUID METER Filed March 10, 1927 a 711 FIG.1.

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INVENTOR 16C 6 Via/wit" mfffm qfwyw 6. Z/fif Patented June 10, 193

ROBERT S. BASSETT, OF BUFFALO, NEW YORK LIQUID METER Application filed March 10, 1927. Serial ljIo. 174,884.

The general objects of the invention are to provide a liquid meter or measuring device adapted to operate under all usual conditions I of service and with water at all fluid temperatures, and to provide a nutating disc piston for this purpose adapted for use in hot or cold water without injury and with large or small flows. I

In the accompanying drawings Figure 1 m is a vertical view of the meter showing a vertical-section through the measuring chamber.

Figure 2 is a vertical section through the disc piston and disc piston reinforcing plate showing the location of the plate in the piston. v

Figure 3 shows ahorizontal section through half of the disc piston and indicates the style and location of the disc piston reinforcing plate.

In these views 1 is the top main casing on which is mounted register box 2. Disc chamber 3 is clamped between top casing 1 and bottom casing 4. 5 is the intermediate gear transmitting the motion of disc piston web 6 to the-meter register encased in register box 2. 7 is the dlsc pin which connects the disc piston to the intermediate gear train 5. 8 is the discpiston reinforcing plate. 9 0 and 10 are bearings in the intermediate gear train and may be constructed of the same material as the disc piston. 11 is the disc piston ball which can be made as shown separate from the disc Web and in two parts, though it can also be molded as an integral part with the disc web 6.

The general construction of the meter shown is well known to the trade and I will not explain in detail the operation of the meter. As the exact construction of the meter casing and intermediate gear train do notmaterially afiect the operation of the disc piston in the disc chamber, I will confine my further description to the exact parts to which my invention pertains.

It has been customary to make. disc-pistons of vulcanized hard rubber, which has a coefiicient of lineal thermal expansion of approximately .00004 per unit of length for 1 Fahrenheit. For a disc piston meterto op- A crate successfully with cold water at the average temperature of approximately 62 Fahrenheit, the .difi'eren'ce in the diameter heit is .0000233, expansion per unit of length for one degree Fahrenheit. On the above basis it is evident that hard rubber which has a coeflicient of lineal thermal expansion of approximately .00004, will seize at a temperature much lower than that of the boiling point and is, therefore, not suitable for use in meters measuring water with an extreme temperature range. Hard rubber softens in boiling water, but when provided with a metallic reinforcing plate the strength is not impaired to such an extent that the water pressure will force the discpiston out of shape slightly, as is the case when a disc piston is made of hard rubber and not provided with a reinforcing plate of some sort.

A suitable material for a disc piston for use with both cold and boiling water should, therefore,'have a coeflicient of lineal thermal expansionthat is less than .0000233. It is essential, however, to have a disc piston reinforcing plate which will have a coeflicient of expansion not less than one-half that of the disc piston material, and I have found that aluminum, with a coefficient of lineal thermal in discs to be used with hot water, though,

if the coefficient of lineal thermal expansion of the disc material can be kept down to very low limits, other metals such as steel and brass may be used for the disc piston reinforcing plates. I have found, however, that the ratio between the coeflicient of lineal thermal expansion of the material and the coefiicient of lineal thermal expansion of the reinforcing plate should not be greater than 2, and should not be less than 1. Heretofore reinforced disc plates have not been constructed with this ratio less than 3, and it is new and novel to construct a disc piston having this ratio between 1 and 2, which I have found necessary to prevent the separation of the two materials in. the disc piston.

A satisfactory material for my disc which can be used with a metallic reinforcing plate Without separation from the disc plate, is made with a base of vulcanized hard rubber loaded with suitable fillers to decrease the coefficient of lineal thermal expansion to within the limits specified. This composition is made by introducing the fillers into the rubber before the final vulcanization process,

as it is not at all difficult to load the rubber with these fillers before vulcanization. Powdered carbon, such as carbon flour, graphite or any powdered amorphous carbon as specified in the claims, together with other finely subdivided fillers such as soap stone, tripoli, fullers earth, etc., will decrease the coefiicient of lineal thermal expansion of a hard rubber base composition when introduced into it in suitable quantities.

' One of the most satisfactory compositions worked out contained by weight 5 to 50%, or 20 to 40%, vulcanized hard rubber, 5 to 50% powdered carbon, the balance being of a suitable finely subdivided filler such as mentioned in the preceding paragraph.

The disc piston itself may be constructed of any material which will come within the above limits, and the exact composition is not restricted. I have, however, worked out a composition which is extremely suitable and which is novel in that it does not Wear down in service, as'is the case with compositions containing powdered graphite, but is lubricated by the water itself to such an extent that there is no appreciable wear on the surfaces of contact between the disc piston and the measuring chamber. My invention also covers a hot water resisting disc ball and a disc web made of hard rubber but held from expanding appreciably by a metal reinforcing plate.

Having described the invention what I claim as new and desire to secure by Letters Patent is:

1. In a disc liquid meter a disc piston formed by weight of a composition of 5 to 50% vulcanized hard rubber, 5 to 50% powdered carbon, the balance to be of a suitable finely subdivided filler, said disc piston having an internal reinforcing member, substantially as and for the purpose described.

2. In a disc liquid meter, a disc piston formed by weight of a composition of 20 to 40% vulcanized hard rubber, 5 to 50% powdered carbon, the balance to be of a suitable finely subdivided filler, said disc piston having an internal reinforcing member, substantially as and for the purpose described.

ROBT. S. BASSETT. 

